// Copyright 2024 The LUCI Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package pbutil

import (
	"fmt"

	"go.chromium.org/luci/common/validate"
)

var (
	instructionIDPattern   = `[a-z][a-z0-9_\-:.]{0,99}`
	instructionIDRe        = regexpf("^%s$", instructionIDPattern)
	instructionNamePattern = fmt.Sprintf("invocations/(%s)/instructions/(%s)", invocationIDPattern, instructionIDPattern)
	instructionNameRe      = regexpf("^%s$", instructionNamePattern)
)

// ParseInstructionName extracts invocationID and instructionID.
func ParseInstructionName(name string) (invocationID, instructionID string, err error) {
	if name == "" {
		return "", "", validate.Unspecified()
	}

	m := instructionNameRe.FindStringSubmatch(name)
	if m == nil {
		return "", "", validate.DoesNotMatchReErr(instructionNameRe)
	}

	return m[1], m[2], nil
}
